Method of manufacturing a valve plate for compressor

Abstract

In a manufacturing method of a valve plate for a compressor according to this invention, a punch die 43 formed with a convex and concave configuration at its tip end face 42 is set at a press machine 41, and the punch die 43 is depressed against a surface of a valve plate 9 to transfer the convex and concave configuration of the tip end face 42. Thus, peripheral portions of a suction port and a discharge port of the valve plate 9 are roughened.

1. A method of manufacturing a valve plate for a compressor which divides a suction chamber and a discharge chamber from a cylinder block, said method comprising the steps of:
 forming in the plate at least one suction port and at least one discharge port; and  
 pressing a punch die with a tip end face having a plurality of fine pyramid-shaped convex portions arranged at a pitch between about 0.5 mm and 1.0 mm, against at least one of a peripheral portion of each suction port with which a reed portion of a suction valve is brought into contacts, and a peripheral portion of each discharge port with which a reed portion of a discharge valve is brought into contact, the punch die forming, through said pressing, a roughened surface on the at least one peripheral portion, the roughened surface having concave portions and return portions projecting from and formed in peripheral edges of said concave portions, a height of the return portions being between about 10 and 50 μm, and a depth of the concave portions being between about 50 and 250.  
 
   
   
     2. A method according to  claim 1  wherein the tip end face configuration of the punch die is transferred onto both peripheral portions of the suction port and the discharge port. 
   
   
     3. A method according to  claim 1  wherein a formation of the suction port and the discharge port and the roughening of the peripheral portions thereof are performed during a common press machining process. 
   
   
     4. A method according to  claim 1  wherein the plate is made of Fe material having a hardness Hv of 90 to 200.